-module(postgleam@codec@numeric).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/postgleam/codec/numeric.gleam").
-export([encode/1, decode/1, matcher/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-file("src/postgleam/codec/numeric.gleam", 191).
-spec list_reverse_loop(list(IRQ), list(IRQ)) -> list(IRQ).
list_reverse_loop(L, Acc) ->
    case L of
        [] ->
            Acc;

        [X | Rest] ->
            list_reverse_loop(Rest, [X | Acc])
    end.

-file("src/postgleam/codec/numeric.gleam", 187).
-spec list_reverse(list(IRN)) -> list(IRN).
list_reverse(L) ->
    list_reverse_loop(L, []).

-file("src/postgleam/codec/numeric.gleam", 61).
-spec read_digits(bitstring(), integer(), list(integer())) -> list(integer()).
read_digits(Data, Count, Acc) ->
    case Count of
        0 ->
            list_reverse(Acc);

        _ ->
            case Data of
                <<D:16, Rest/bitstring>> ->
                    read_digits(Rest, Count - 1, [D | Acc]);

                _ ->
                    list_reverse(Acc)
            end
    end.

-file("src/postgleam/codec/numeric.gleam", 176).
-spec split_at_loop(list(IRI), integer(), list(IRI)) -> {list(IRI), list(IRI)}.
split_at_loop(L, N, Acc) ->
    case N =< 0 of
        true ->
            {list_reverse(Acc), L};

        false ->
            case L of
                [] ->
                    {list_reverse(Acc), []};

                [X | Rest] ->
                    split_at_loop(Rest, N - 1, [X | Acc])
            end
    end.

-file("src/postgleam/codec/numeric.gleam", 172).
-spec split_at(list(IRE), integer()) -> {list(IRE), list(IRE)}.
split_at(L, N) ->
    split_at_loop(L, N, []).

-file("src/postgleam/codec/numeric.gleam", 199).
?DOC(" Encode a numeric string to PostgreSQL binary format\n").
-spec encode_numeric_string(binary()) -> {ok, bitstring()} | {error, binary()}.
encode_numeric_string(S) ->
    {ok, postgleam_ffi:encode_numeric(S)}.

-file("src/postgleam/codec/numeric.gleam", 28).
-spec encode(postgleam@value:value()) -> {ok, bitstring()} | {error, binary()}.
encode(Val) ->
    case Val of
        na_n ->
            {ok, <<0:16, 0:16, 16#C000:16, 0:16>>};

        pos_infinity ->
            {ok, <<0:16, 0:16, 16#D000:16, 0:16>>};

        neg_infinity ->
            {ok, <<0:16, 0:16, 16#F000:16, 0:16>>};

        {numeric, S} ->
            encode_numeric_string(S);

        _ ->
            {error,
                <<"numeric codec: expected Numeric, NaN, PosInfinity, or NegInfinity"/utf8>>}
    end.

-file("src/postgleam/codec/numeric.gleam", 161).
-spec pad_digit(integer()) -> binary().
pad_digit(D) ->
    S = erlang:integer_to_binary(D),
    Len = string:length(S),
    case Len of
        1 ->
            <<"000"/utf8, S/binary>>;

        2 ->
            <<"00"/utf8, S/binary>>;

        3 ->
            <<"0"/utf8, S/binary>>;

        _ ->
            S
    end.

-file("src/postgleam/codec/numeric.gleam", 112).
-spec int_digits_to_bytes(list(integer()), boolean(), bitstring()) -> binary().
int_digits_to_bytes(Digits, Is_first, Acc) ->
    case Digits of
        [] ->
            case gleam@bit_array:to_string(Acc) of
                {ok, S} ->
                    S;

                {error, _} ->
                    <<""/utf8>>
            end;

        [D | Rest] ->
            S@1 = case Is_first of
                true ->
                    erlang:integer_to_binary(D);

                false ->
                    pad_digit(D)
            end,
            int_digits_to_bytes(Rest, false, <<Acc/bitstring, S@1/binary>>)
    end.

-file("src/postgleam/codec/numeric.gleam", 108).
-spec int_digits_to_string(list(integer()), boolean()) -> binary().
int_digits_to_string(Digits, Is_first) ->
    int_digits_to_bytes(Digits, Is_first, <<>>).

-file("src/postgleam/codec/numeric.gleam", 147).
-spec frac_raw_bytes(list(integer()), bitstring()) -> binary().
frac_raw_bytes(Digits, Acc) ->
    case Digits of
        [] ->
            case gleam@bit_array:to_string(Acc) of
                {ok, S} ->
                    S;

                {error, _} ->
                    <<""/utf8>>
            end;

        [D | Rest] ->
            S@1 = pad_digit(D),
            frac_raw_bytes(Rest, <<Acc/bitstring, S@1/binary>>)
    end.

-file("src/postgleam/codec/numeric.gleam", 143).
-spec frac_raw(list(integer())) -> binary().
frac_raw(Digits) ->
    frac_raw_bytes(Digits, <<>>).

-file("src/postgleam/codec/numeric.gleam", 207).
-spec repeat_char(binary(), integer()) -> binary().
repeat_char(C, N) ->
    case N =< 0 of
        true ->
            <<""/utf8>>;

        false ->
            string:copies(C, N)
    end.

-file("src/postgleam/codec/numeric.gleam", 133).
-spec frac_digits_to_string(list(integer()), integer()) -> binary().
frac_digits_to_string(Digits, Scale) ->
    Raw = frac_raw(Digits),
    Len = string:length(Raw),
    case Len >= Scale of
        true ->
            binary:part(Raw, 0, Scale);

        false ->
            <<Raw/binary, (repeat_char(<<"0"/utf8>>, Scale - Len))/binary>>
    end.

-file("src/postgleam/codec/numeric.gleam", 72).
-spec digits_to_string(list(integer()), integer(), integer(), integer()) -> binary().
digits_to_string(Digits, Weight, Scale, Sign) ->
    Prefix = case Sign of
        16#4000 ->
            <<"-"/utf8>>;

        _ ->
            <<""/utf8>>
    end,
    case Digits of
        [] ->
            case Scale > 0 of
                true ->
                    <<<<Prefix/binary, "0."/utf8>>/binary,
                        (repeat_char(<<"0"/utf8>>, Scale))/binary>>;

                false ->
                    <<Prefix/binary, "0"/utf8>>
            end;

        _ ->
            Int_groups = Weight + 1,
            {Int_digits, Frac_digits} = split_at(Digits, Int_groups),
            Int_str = int_digits_to_string(Int_digits, true),
            Int_str@1 = case Int_str of
                <<""/utf8>> ->
                    <<"0"/utf8>>;

                S ->
                    S
            end,
            case Scale > 0 of
                true ->
                    Frac_str = frac_digits_to_string(Frac_digits, Scale),
                    <<<<<<Prefix/binary, Int_str@1/binary>>/binary, "."/utf8>>/binary,
                        Frac_str/binary>>;

                false ->
                    <<Prefix/binary, Int_str@1/binary>>
            end
    end.

-file("src/postgleam/codec/numeric.gleam", 49).
-spec decode_numeric(integer(), integer(), integer(), integer(), bitstring()) -> {ok,
        postgleam@value:value()} |
    {error, binary()}.
decode_numeric(Ndigits, Weight, Sign, Scale, Data) ->
    Digits = read_digits(Data, Ndigits, []),
    Str = digits_to_string(Digits, Weight, Scale, Sign),
    {ok, {numeric, Str}}.

-file("src/postgleam/codec/numeric.gleam", 38).
-spec decode(bitstring()) -> {ok, postgleam@value:value()} | {error, binary()}.
decode(Data) ->
    case Data of
        <<_:16, _:16/signed, 16#C000:16, _:16>> ->
            {ok, na_n};

        <<_:16, _:16/signed, 16#D000:16, _:16>> ->
            {ok, pos_infinity};

        <<_:16, _:16/signed, 16#F000:16, _:16>> ->
            {ok, neg_infinity};

        <<Ndigits:16, Weight:16/signed, Sign:16, Scale:16, Rest/bitstring>> ->
            decode_numeric(Ndigits, Weight, Sign, Scale, Rest);

        _ ->
            {error, <<"numeric codec: invalid data"/utf8>>}
    end.

-file("src/postgleam/codec/numeric.gleam", 24).
-spec build(integer()) -> postgleam@codec:codec().
build(Type_oid) ->
    {codec, <<"numeric"/utf8>>, Type_oid, binary, fun encode/1, fun decode/1}.

-file("src/postgleam/codec/numeric.gleam", 14).
-spec matcher() -> postgleam@codec:codec_matcher().
matcher() ->
    {codec_matcher, <<"numeric"/utf8>>, [1700], none, binary, fun build/1}.